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Sökning: WFRF:(Sato Kento)

  • Resultat 1-3 av 3
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1.
  • Chien, Steven W.D., et al. (författare)
  • Improving Cloud Storage Network Bandwidth Utilization of Scientific Applications
  • 2023
  • Ingår i: Proceedings of the 7th Asia-Pacific Workshop on Networking, APNET 2023. - : Association for Computing Machinery (ACM). ; , s. 172-173
  • Konferensbidrag (refereegranskat)abstract
    • Cloud providers began to provide managed services to attract scientific applications, which have been traditionally executed on supercomputers. One example is AWS FSx for Lustre, a fully managed parallel file system (PFS) released in 2018. However, due to the nature of scientific applications, the frontend storage network bandwidth is left completely idle for the majority of its lifetime. Furthermore, the pricing model does not match the scalability requirement. We propose iFast, a novel host-side caching mechanism for scientific applications that improves storage bandwidth utilization and end-to-end application performance: by overlapping compute and data writeback through inexpensive local storage. iFast supports the Massage Passing Interface (MPI) library that is widely used by scientific applications and is implemented as a preloaded library. It requires no change to applications, the MPI library, or support from cloud operators. We demonstrate how iFast can accelerate the end-to-end time of a representative scientific application Neko, by 13-40%.
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2.
  • Sato, Yosuke, et al. (författare)
  • Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement
  • 2022
  • Ingår i: Physical Review Letters. - 0031-9007. ; 128:20
  • Tidskriftsartikel (refereegranskat)abstract
    • The Josephson junction of a strong spin-orbit material under a magnetic field is a promising Majorana fermion candidate. Supercurrent enhancement by a magnetic field has been observed in the InAs nanowire Josephson junctions and assigned to a topological transition. In this work we observe a similar phenomenon but discuss the nontopological origin by considering the trapping of quasiparticles by vortices that penetrate the superconductor under a finite magnetic field. This assignment is supported by the observed hysteresis of the switching current when sweeping up and down the magnetic field. Our experiment shows the importance of quasiparticles in superconducting devices with a magnetic field, which can provide important insights for the design of qubits using superconductors.
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3.
  • Ueda, Kento, et al. (författare)
  • Evidence of half-integer Shapiro steps originated from nonsinusoidal current phase relation in a short ballistic InAs nanowire Josephson junction
  • 2020
  • Ingår i: Physical Review Research. - 2643-1564. ; 2:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on half-integer Shapiro steps observed in a gate-tunable short ballistic InAs nanowire Josephson junction. We observed the Shapiro steps of the short ballistic InAs nanowire Josephson junction and found the half-integer steps in addition to the conventional integer steps. In this Josephson junction device the junction transmission can be varied with gate voltage. From measurements of the gate voltage and temperature dependences of the Shapiro steps, the origin of half-integer steps is assigned to the skewness of the current phase relation in the short ballistic Josephson junctions. These results will contribute to establish and control the superconductivity physics in the short ballistic semiconductor nanowires.
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  • Resultat 1-3 av 3

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